Table 2. Phenotype description for case only study in skeletally matured patients with non-progressive (NP-IS), slowly progressive (SP-IS) and rapidly progressive (RP-IS) idiopathic scoliosis.

	cases N = 253
phenotype subgroups	NP-IS	SP-IS	RP-IS
	N = 93	N = 104	N = 56
age range (years)	16–52	16–59	12–54
Risser	4 or 5	4 or 5	all
skeletal maturity	yes	yes	no
back deformity	idiopathic scoliosis (rib hump)	idiopathic scoliosis (rib hump)	idiopathic scoliosis (rib hump)
curve pattern	all	all	all
Cobb angle at final visit (range)	10°–30°	30°–65°	35°–114°
Cobb angle at final visit (mean ±SD)	23.3°±5.6°	40.3°±9.2°	69.5°±19.2°
progression rate in degrees per month (range)	NA	0.04°–0.95°	1.0°–3.2°

NA – non applicable.